支重台车易发生平衡臂从摆动轴处断裂的事故,其主要原因是摆动轴与小轴套卡死,二者之间不能相对转动,摆动轴不能摆动,两者与外平衡臂成为一体。当拖拉机在不平路面上行驶时,内外平衡臂不能灵活地相对转动以压缩台车平衡弹簧,使平衡臂摆动轴孔处受到很大冲击力,久而久之从此处断裂。具体原因及解决方法如下: The main reason that the counterweight trolley breaks the balance arm from the oscillating shaft is that the oscillating shaft and the small shaft sleeve are stuck and the two can not rotate relative to each other. The oscillating shaft can not be swung. Both of them are integrated with the external balance arm . When the tractor travels on an uneven road, the inner and outer balance arms can not flexibly rotate relative to each other to compress the balance spring of the trolley, so that the balance arm can be greatly shaken at the pivot hole of the balance arm and break from there over time. Specific reasons and solutions are as follows: